Motor vehicle



E. G, GUNN.

MOTOR VEHICLE. 'APPLICATION FILED DEC. 11, 19m.

:M345 l 3L., mma Novl 7, w22;

Patented Nov. 7, 1922.. v

intatti itl W ll O EARL G. GUNN, OF DETROIT, MICEGAN, ASSGNOR TO PACKARD MOTOR OAR COMPANY, OF DETROIT, IVHOHGAN, A CORPORATION OF MICHIGAN.

MOTOR VEHICLE.

T all wzfom t may concern Be it known that 1, EARL Gf. GUNN, a citi-A Zen of the United States, and resident of Detroit, lWayne County, State ot Michigan, have invented certain new and useful lmprovements in Motor Vehicles, ot which the following is a specification.

This invention relates to motor vehicles and more particularly to brake mechanism for'suchvehicles.

The invention has 'for its object to provide vide means for taking up the wear between the coacting parts of the braking mechanism whereby the same length of throw ot the operating members will produce substantially the same braking action after the parts have been worn as when the parts were new.

Another object of the invention is to provide a mounting for motor vehicle brakes ot simple and eicient construction and comprisingn few parts. 1

Another ob'ect of the invention is to pro-v vide a construction in which the braking elements are4 so mounted that they may be assembled prior to being secured in place on the motor vehicle.

Other objects of the invention than those lspecifically stated above will be apparent trom the following descrip-tion taken in con-- nection .with the drawings, in which:

Figure 1 is a horizontal sectional view through the improved brake mechanism taken substantially on line 1-1 of Figure 2; Figure 2 is a sectional view, partly broken away, taken on line 2 2 of Figure 1;

Figure 3 is a sectional detail view taken on line 3-3 of Figure 2, and

Figure L1' is a detail View in perspective illustrating one of the operating parts shown in Figure 3.

rllhe brake. mechanism is mounted, as is usual, on an axle tube orcasing 10 ot the rear axle ot a motor vehicle, a portion 11 o' the central housing being'sliownv in Figure 1, this housing enclosing the usual transmission mechanism. rlhe tubular casing 10, is provided at its ouml' end with an outwardly extending annular iange 12 to' which is Application Filed liecember 17, 1919. Serial No. 345/151.

bolted a brake shoe supporting member 13 which is preferably formed of stamped steel plate asillustrat'ed in Figure 1. The axle section lll is supported at its innerend in any suitable manner in the casing 10 and preferably in such a way that it may be withdrawn longitudinally from the casing. At its outer end the section 14 is 'supported in ball bearings 15, the inner race of which is mounted on the axle section or shaft between a screw threaded collar or nut 16 and a ianged collar 17. Felt packing 18 is mounted on'the collar 1,7 and is received by a recess 19 formed in the collar 20, which in turn is, provided with an outwardly extendingI annular flange 21. rlhe flange 21 of the colla-r 2O is secured to the brake shoe supporting member or plate 13 by means of bolts 22 which also secure theplate 13 to the flange 12 of the axle tube 10, shoulders 23 on the bolt 22 engaging the surface of the plate 13 and the bolts preferably being headed over asl shown at 24H30 secureA the bolts to the flange 21.

As will be seen from the showing in Figure 1, the outer ball race 25 is positioned' between the collar 20, and a recessed portion 26 of the axle tube, being retained in this position by the bolts 22 `which secure the collar 20and plate 13 to the llange 12 of the axle tube. rlhe axle section 111 may be ot' any suitable construction at its outer end but in the form of the invention illustrated this member is enlarged as shown at 27 and is provided with a laterally extending flange 28 to which is secured by means of rivets 29 the brake drum 30'. rlhe enlarged portion of the end of the axle'torms an inner f l hub upon whichis mounted a hub 31 of a wire wheel.`

The mounting of the brake shoes and the operating mechanism forthe brake shoes is illustrated in detail in Figure 2 and will now be described.

rlhe brake shoes 32 are pivotally mounted as shown at 33 at one end ot the supporting plate 13, each of the shoes being provided at its pivoted end with a pair of alined, spaced, lugs 34 through which the pivot pins extend. Each of the shoes is provided with a cent-rally ,disposed strengthening rib 35 which extends substantially throughout the length of the shoe and a spring 36 engages, at its opposite ends, pins 37 carried by the ribs 35, the spring acting to retract the shoes afterthe shoe actuating means has been released. j

The supporting plate 13 is bifurcated at its lower end shown at 38, the biurcated portions 38 being provided with laterally extending lugs 39, which may take theform yof rivets if desired, these lugs acting as stops to limit the inward'movement of the shoes, in a-manner hereinafter described.

The brake shoe actuatingmechanism comprises an arm 40, shown in detail in Figure 3, and pivotally supported on flanged bushings 4l carried by a transversely extending pin 42 mounted on one of the bifurcated portions of the supporting plate, the pivoted end of the arm being bifurcated as shownv at 43. This arm may be actuated in any suitable manner and in the form of the invention shown is actuated by means of a tubular rod 44 which Tis providedwith diametrically opposed slots 45 which engage outwardly extending lugs 46 formed on one of the bifurcated portions of the arm '40. vIt will of course be understood that the rod 44 is connected inthe usual manner with an operating lever or foot pedal on the vehicle. At its free end the actuating arm 40 carries' a pivot' pin 49, upon which is pivotally mounted a link 48, the `lower end of which is pivotally connected by a pin 49 to a pair of toggle Alin-ks 50. The links 50 are slotted at their free ends as shown at 51, the slots receiving transversely extending pins 52 carried by alined ears 53 formed on the free ends of the brake shoes. The central ribs 35 of the brake shoes are cut away as shown at 54 to permit the entrance of the slotted free ends ofthe toggle links 50 between the ears 53.

As' is well known, the coacting parts of the brake mechanism of a motor vehicle receive hard wear and to compensate for this wear between the coacting parts the toggle links 50'are provided with adjustable screws 55 which are threaded into oii'set portions 56 formed on the links and are positioned in 'such a manner. that they extend into the slots 51 formed in the free ends of the links and vary the effective lengths of these slots after they are adjusted. Lock nuts 57 are carried by the screws 55 to retain them in adjusted position. The free ends of the toggle links 50 are also provided with outwardly extending lugs 58 which are adapted to engage the lugs 39 carried by the lowery ends of the bifurcated portions 3 8 of the supp porting plate 13, thereby limiting-the inward movement of the brake shoes caused by. the spring 36.

The operation of the brake mechanism may be briefly described, asfollows: When the operator desires to throw the braking mechanism into operation, thev rod 44 is rotated by means of suitable hand or foot mechanism, whereupon the arm 40 is rotated,

Lesa-,eli

moving the link 48 in a directien toward the brake drum and thereby forcing the toggle links 50 about the pivot pin 49 in aldirection to cause the brake shoes to engage the brake' drum. After the brake mechanism has been used for a considerable length of time and the brake shoes and brake drum have become worn, the screws may be adjusted in a manner .to cause the inner ends thereof to. enter the slots 5l of the toggle links thereby decreasing the eiiective lengths of these slots in order tov compensate for the wear. After this adjustment has been made the actuation ofthe arm40 and the toggle links 50, tothe same extent as when the brake mechanism was' new, will cause the same braking action to take place. In other words, the effective braking action caused by the normal movement of the operating mechanism has not been diminished by the wear on the cooperating parts.

lVhen the actuating mechanism for the brake has been released the spring 3G retracts the shoes to their normal position, in which position the lugs 58 carried by the toggle links 50 engage the lugs 39 carried by the lower bifurcated ends of the supporting plate 13. l

From ythe above description it will be seen that a simple and effective brake mechanism has been ydevised and moreover a mechanism by means of which the Wear between the coacting parts may be 'compensated for, thereby increasing the life of the brake. It will also be seen that the mechanism has been mounted upon the supporting member or plate in such a manner that all the. operating parts thereof may-be assembled before placing the brake in position on the motorvehicle, thus permitting of the necessary adjustments to be made prior to the shipment of the braking mechanism fromv the factory. I y

lVhile one embodiment of the inveifition has been specifically described land illustrated, it should be understood thatjthe invention is capable of modification and that modications and changes may be made in the construction and in the arrangement of the cooperating parts without departing from the spirit or scope of the invention as expressed in the following claims.

What I claim and desire to secure by Let'- ters Patent is: 1

l. Brake mechanism comprising a drum,

Aa pair of brake shoes adapted to coact therewith, means includingtoggle links for moving said shoes into engagement with said drum, said links being connected to said 1 shoes through pin and slot connections, and adjustable means for varying the effective llengths of said slots.

2. Brake mechanism comprising a drum,

a'pair of brake shoes adapted to coact therewith, means including toggle links for movsaid shoes into engagement drinn., said' links hating slots adjacent their `free ends, pins carried by said brake shoes and disposed in said slots, and means carried by said links for aryiyng the effective lengths of said slots.

Brake mechanism including, in combi nation, a supporting member, brake shoes pirated thereon, an arm'pivoted on said sup porting member, )and toggle links operatively connected to said arm and to said shoes for swinging said shoes about their pivots into engagement with said drum.

Blake-mechanism including, in coinbination, a drum, a supporting member, brake shoes pivoted thereon, means tor moving said brake shoesabout their pivots into engagement with said drum, and stops car-- ried by said supporting member 'for limiting the movement of said brake shoes away from said drum.

5. Brake mechanism including, in combination, a drum, a supporting plate, brake shoes pivoted thereon, an arm pivoted on said supporting plate, and toggle links operatively connected to said arm and to said brake shoes for moving said brake shoes into engagement *with said drum.

6. Brake mechanism including, in conibination, a drum, a supporting plate, brake shoes Apivoted thereon, an aim kpivoted on said supporting plate, toggle links ad justably connected to said shoes and opera-A links iifotall connected `tosaid last named link and operatively connected to said braise shoes. y I

8. Brake mechanism including, in cembination, a drum, a supporting plate bifurcated at one end, brake shoes pivoted to said plate at the opgosite end, an arm pivoted on one of the biturcated portions of said plate, a linlr pivoted to said arm, and toggle links pivotally connected to said last named link and adjustably connected to said brake shoes.

9. Brake mechanism including a drum, a supporting member, brake shoes adapted to cooperate therewith, actuating means for' said brake shoes including toggle links, and means carried by said toggle links and adapted to engage said supporting member for limiting the movement 01"' said brake shoes in a direction away from said drinn.

ln testimony whereof l adx my sia-nature.

nani, e. sims. 

